Respuesta :

Work = F x D

= (45 N) (1.2 M)

= 54

AL2006

Gravity pulls down.  So horizontal motion doesn't do ANY work against gravity.  You can ignore that part.

The only work done is when you lift the bag.

Work = (force) x (distance)

Work = (45 N) x (1.2 m) = 54 Joules